Device for control of an electric fuel pump

Abstract

The invention relates to a device for control of an electric fuel pump ( 1, 2 ) on a motor vehicle, whereby, on a fault in an electronic controller ( 3 ), the fuel pump ( 1, 2 ) is connected to the voltage supply of the vehicle. The fuel pump ( 1, 2 ) then pumps at full capacity. Said device offers a high security against a break in the supply of fuel.

1 . A device for actuating an electric fuel pump for a motor vehicle having an electronic controller for regulating the power of the fuel pump, said controller being arranged between a power supply and the fuel pump, and having a pressure sensor for monitoring a pressure which is generated by the fuel pump, characterized in that the electronic controller ( 3 ) is connected to a monitoring device ( 4 ) and means for connecting the fuel pump ( 1 ,  2 ) to the power supply when the electronic controller ( 3 ) has a fault are provided.  
     
     
         2 . The device as claimed in  claim 1 , characterized in that the electronic controller ( 3 ) or the monitoring device ( 4 ) has means for connecting the fuel pump ( 1 ,  2 ) to the power supply when the pressure sensor ( 7 ) has a fault.  
     
     
         3 . The device as claimed in  claim 1  or  2 , characterized in that the connection of the fuel pump ( 1 ,  2 ) to the power supply is unregulated.  
     
     
         4 . The device as claimed in at least one of the preceding claims, characterized in that the fuel pump ( 1 ,  2 ) has a switch ( 9 ,  10 ), in that the switch ( 9 ,  10 ) can be actuated by the monitoring device ( 4 ) and is designed to connect the fuel pump ( 1 ,  2 ) to the electronic controller ( 3 ) in one position, and to the power supply in the other position.  
     
     
         5 . The device as claimed in at least one of the preceding claims, characterized in that the switch ( 9 ,  10 ) has a relay ( 8 ).  
     
     
         6 . The device as claimed in at least one of the preceding claims, characterized in that a single electronic controller ( 3 ) is designed to actuate a plurality of fuel pumps ( 1 ,  2 ).  
     
     
         7 . The device as claimed in at least one of the preceding claims, characterized in that the fuel pump ( 1 ,  2 ) is connected to a mechanical pressure regulator ( 17 ).  
     
     
         8 . The device as claimed in at least one of the preceding claims, characterized in that each of the fuel pumps ( 1 ,  2 ) has its own switch ( 9 ,  10 ).  
     
     
         9 . The device as claimed in at least one of the preceding claims, characterized in that the monitoring device ( 4 ) and the control unit ( 5 ) of the internal combustion engine have a common connection ( 15 ) for a diagnostic device.